<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- select标签:下拉菜单栏的整体 -->
    <select  id="">
        <!-- option:下拉菜单栏的每一项 value中放入属性值 -->
        <option>云南</option>
        <!-- selected默认选中,其信息会在菜单栏默认第一个显示 -->
        <option  selected>贵州</option>
        <option>四川</option>
    </select>
</body>
</html>